Disazo dyes



Patented Apr. 19, 1949 DISAZO DYES Otto Kaiser, Dornach, and Ernst Reich, Neue Welt, neanBaseLiSwitzerland, assignors to Ciba Limited, a'Swiss firm :No "Drawing. Application February '8, 1946, Se-

rial No. 646,499. In Switzerland February 20,

6 Claims. .(Cl. 260153) v .1 According to "this invention valuable new dyestufis suitable for dyeing 'cellulose are made by coupling a diazotize'd ortho-aminophenol of the general formula in which R represents an aryl radical, and in which any inuclear hydrogen :atom may be replaced by a substituent,'ior example, a halogen atom or a nitro gmunwith N-substitution'pro'd nets of 2-amino-5-hydroxynaphthalene-7-sulfonic'acid.

'The dyestuffs -so obtained which correspond in their free-state to th'e general formula wherein R has the; above mentioned meaning, and X represents the radical of an N-substitution product of Z-amino-5-hydroxynaphthalene-7- sulfonic acid, can be converted on the fiber into complex 'metal compounds, especially complex copper wcompounds, whereby the properties '.of fastnessoof "thedyestufis are considerably improved. 7

As compared with the dyestuffs of 'the French Patent of addition No. 22,841 (addition to French Patent No. 481,190), the new dyestufis have a considerably better afiinity for cellulose fibers.

The ortho-amino-phenol carboxylic acid amides used for making the new dyestufis can be obtained in known manner by the reactionnf a 1-hydroxy-2-nitrobenzene-4-carb'oxylic acid with an amine in the presence of an agentrca pable of removing water, followed by reduction of the resulting amide.

As l-hydroxy-2-nitrobenzene-carboxylic acids there eome into consideration, for example, 1- hydroxyeil-nitrobenzene-:4-carboxylic acid, 1- hydroxy- 2-.nitro-fiachlorobenzen 4 carboxylic acid, 1-hydroxy--2-nitro16-bromobenzene-4warboxylic-zaci'd: or-thelike.

' For-reaction with these ;-a.cids -01. their chlorides there may be used, among others, :the following amines:

l-aminobenzene, .2-chloro-l-aminobenzene, 2- methoxy-l-aminobenzene, 4 -.ethoxy L-aminobenzene, 4-methyl-1-aminobenzene, l-aminonaphthalene, 2 aminonaphthalene, and the like.

A coupling components there come primarily into consideration:

Derivatives of 2-amino 5-hydroxynaphthalene-l-sulfonic acid, for example N-acyl derivatives, such as 2-acetylamino-, 2-carboxyethylamino-, 2-benzoylamino-,12-(2:4-dichlor) -benzoylamino-, 2- (4-methoxy) -benZoylamino-5-hydroxynaphthalene-7-sulfonic acid, and the symmetrical urea :of 2eamino 5-hydroxy-naphthalene-7-s11lf0nic acid, furthermore unsymmetrical ureas of 2-amino-5-hydroxynaphthalene-7- sulfonic acid, whichimay contain azo-groups, as for instance the unsymmetrical urea, which is obtained by the reaction of phosgene on one molecular proportion of 2-amino-5-hydfOXY- naphthalene-'l-sul'fonic acid and one molecular proportion of '4-amino-4'-hydroxy-l:1-azobenzene-3-carboxylic acid. Further must be mentioned N-alkylor N-aryl-derivatives of -2- amino-5-hydroxynaphthalene -7 sulfonic acid such as 2-ethylamino-5-hydroxynaphthalene-7- sulfonic acid, 2-5 hydroxyethylamino 5 hydroxynaphthalene-7-sulfonic acid, 2-phenylamino-5-hydroxynaphthalene 7 sulfonic .acid and derivativesthereof substitutedin the phenyl nucleus, such as 2-(4'- methoxy)-,,2-(4-chlor)-, 2-(4=-carboxy) 2-(3 -.carboxy) 2 -:(4' -.hydroxy-.3'-carbox y)-, 2-(4' sulfo) or 2 (4- methoxy) phenylamino 5 hydroxynaphthalene-fl-sulfonic .acid, .5r5 -odihydroxy -.2:2' dinaphthylamine-l:7-disulf0nic acid; and also, preferably, reaction products of .heterocyclic compounds containing reactive halogen atoms, with 2-amino-5-hydroxynaphthalene-7-sulfonic acid, such as the secondary condensation product from linolecular proportion of. 2-amino-:.5- hydroxynaphthalene-7-sulfonic :acid, 1 molec- .ular,proportion of cyanuricchloride-andil molecular proportion of l-aminobenzene; thegsecondary condensation product from 2 molecular proportions of Z-amino-5-hydroxynaphthalene- 'T-sulfonic acid and 1 molecular proportionof cyanuric chloride; the secondary condensation product from 1 molecular proportion of.2-amino- 5-hydroxynaphthalene-7-sulfonic acid, 1 molecular proportion .of 2eamino-8-hydroxynaphthalene-G-sulfonic acid and 1 molecularproportion of cyanuric chloride; the ternary condensation productfrom 2 molecular.v proportions 01:12- amino-5-hydroxynaphthalene '7 ;sulfonic acid, 1 molecular proportion of 'l-aminobenzene and 1 molecular proportion of cyanuric chloride; and red shade. The dyeing is fast to washing and the ternary condensation product from 1 molight. lecular proportion of 2-amino-5-hydroxynaph- Similar dyestufis are obtained if the 2 molecthalene-T-sulfonic acid, 1 molecular proportion of ular proportions of l-hydroxy-Z-aminobenzene- 1-amino-4-hydroxybenzene-3-carboxylic acid or 5 4-carboxylic acid phenylamide used per 1 molecu- 1 molecular proportion of 4-amino-4-hydroxylar proportion of coupling component in this ex- 1:1'-azobenzene-3'-carboxylic acid, 1 molecular ample, are replaced by 2 molecular proportions of proportion of l-aminobenzene and 1 molecular 1-hydroxy-2-aminobenzene-4-carboxylic acidproportion of cyanuric chloride, and the like. (1-naphthyl)-amide or by 1 molecular propor- The dyestuffs obtained with the foregoing comtion of 1-hydroxy-2-aminobenzene-4-carboxylic ponents may :be converted on the fiber, after dyeacid-(4'-tolyl) -amide and 1 molecular proportion ing, into complex copper compounds by methods of 1-hydroxy-2-aminobenzene--carboxylic acidin themselves known, the treatment with an agent (2-chlorophenyl) -amide. yielding copper being carried out in the dyebath The replacement of the triazine derivative used or in a separate bath. Thus, there come into as coupling component by the symmetrical urea consideration, for example after-coppering with derivatives of 2-amino-fi-hydroxynaphthalene-7- copper sulfate, in the heat, after-coppering With sulfonic acid leads to similar dyestufis.

copper salts in the presence of water-soluble con- Finally, replacing, in this example, the ternary densation products from formaldehyde and comtriazine condensation product used as coupling pounds like melamine or dicyandiamidine or cop- 2 component by the secondary condensation prodpering in the exhausted dyebath with complex not from 1 molecular p p rtion of cy c c compounds of copper salts and aliphatic hydroxyride and 2 molecular proportions of 2-amino-5- carboxylic acids like tartaric acid. hydroxynaphthalene-7-sulfonic acid, the other The new dyestuffs have in general a good prescriptions of this example remaining the same,

afiinity for cellulose fibers, and yield dyeings e dy s uff is obt d W s dy i w n pwhich are distinguished by good wet fastness pered on the fiber, are also r y properties and a good fastness to light. A modification of the prescriptions of this ex- The invention is illustrated in the followin example consisting in the use, in t se, of a mixamples, which could be modified by the substituture of 11.4 parts of 1- y r0 ye enetion of any of the components named in the open- -carboxylic acid phenyl i e and parts of ing part of this specification, and which ive more Y yne-4-carboxylic aciddetailed information regarding the manufacture, 'P -amide instead o Parts Of properties and use of the new dyestufis. The l'hydroxyz"amnobenzene 4 carboxylic acid parts are by weight. phenylamide, results in a dyestuff with very similar properties.

Example 1 Example 2 parts of 1-hydroxy-2-aminobenzene-4-car- 223 parts f 1 hyd 2 i boxylic acid phenylamide are diazotized with the carboxylic acid phenylamide are diazotized at addition of parts of sodiumfiitlite and 27 0 0. with the addition of 6.9 parts of sodium Parts 9 concentrated hydrochlm? at nitrite and 2'7 parts of concentrated hydrochloric diazo'compound i coupled wlth 23 parts of 5:5 -d1hydroxy-2:2'-dmaphthylamine-7:7-d1sulacid. The dlazo-compound 15 coupled with 36.8

arts of th t n d d f 1 fonlc acid, which has been dissolved in the form p ul e F con ensa Ion P uct of its sodium salt in 1000 parts of Water with the mo 80 of Cyanurlc chlorlde' 2 addition of 100 parts Of calcium hydroxide of 20 molecular proportions of per cent. strength. After 4 hours the dyestufi so naphtha1enB-7-Su1f0ni0 acid and 1 molecular P obtained which in the free state corresponds to portion of aminobenzene, the said condensation the formula; product having been dissolved in the form of its HO3S\ soin OH HN HO sodium salt in 1000 parts of water with the addition of 100 parts of calcium hydroxide of 20 per cent. strength. After 4 hours the dyestufi so N=Nm obtained is precipitated by means of hydrochloric H acid and separated by filtration. The filter resi- H due is brought into solution in the form of its b sodium salt. The dyestuflf which in the free state corresponds to the formula is separated from the solution by means of sodium is precipitated by the addition of hydrochloric chloride, separated by filtration and dried. It is a acid, and separated by filtration. The filter resiblack powder Which dyes cotton red tints from a due is brought into solution in the form of its weakly alkaline bath. By adding to the dyebath sodium salt, precipitated by means of sodium a copper salt solution made from copper sulfate chloride, separated by filtration and dried.

and sodium tartrate the tint acquires amore ruby The new dyestufi of the above formula is a same, a dyestuff is obtained which dyes cotton in red violet tints, the fastness properties of which can be improved by after-coppering.

Example 3 22.8 parts of 1-hydroxy-2-aminobenzene-b carboxylic acid-phenylamide are diazotized at C. with the addition of 6.9 parts of sodium nitrite and 24 parts of concentrated hydrochloric acid and the diazo compound is combined with 36.8 parts of the ternary triazine condensation product from 1 molecular proportion of cyanuric chloride, 1 molecular proportion of 2-amino-5- hydroxynaphthalene-7-sulfonic acid, 1 molecular proportion of 4-amino-4'-hydroxy-1:l'-azobenzene-3-carboxylic acid and. 1 molecular proportion of aminobenzene which condensation product has first been dissolved in the form of its sodium salt in 1000 parts of water and rendered alkaline by addition of 100 parts of calcium hydroxide of 20 per cent. strength. Four hours later, the dyestufi which has been formed is separated by means of hydrochloric acid and filtered. The filter residue is dissolved in the form of its sodium salt. The dyestutf which in the free state corresponds to the formula:

is separated from the solution by means of sodium chloride, filtered and dried.

It is a black powder which dyes cotton in a weakly alkaline bath in red tints. By aftertreatment of the dyeing with solutions containing copper salts and basic Water-soluble condensation products from formaldehyde and melamine or similar products, tints are obtained which are fast to washing and light.

The replacement in this example of the ternary triazine condensation product used as coupling component by the secondary triazine condensation product from 1 molecular proportion of cyanuric chloride, 1 molecular proportion of 2--amino-5-hydroxynaphthalene-7-sulfonic acid and 1 molecular proportion of 4-amino-4'-hydroxy-l:1-azobenzene-3'-carboiqrlic acid leads to a dyestuif with similar properties.

A dyestuif giving similar brown-red shades if used according to the prescriptions of this example, is obtained by using, instead of the ternary triazine condensation product, a coupling component obtained by the action of phosgene on weakly alkaline solutions which contain equivalent weights of 2-amino-5-hydroxynaphthalene- V-sulfoni'c acid and of the monoazo-dye'stuff i-amino-y-hydroxy-lz 1'-azobenzene-3'-carboxylic acid.

What we claim is:

1. An a'zo dyestufi of the formula in which R stands for an aromatic radical containing at the most two condensed rings, Y stands for a link consisting of the atom groupings represented by one of the symbols and Z stands for the radical of a monoazo dyestuff.

4. The dyestuff which in its free state corresponds to the formula SOsH so H |T HO K N-N- \C H 0 H0 NH H 5. The dyestufi which in its free state corresponds to the formula N 0 s HO H a NH-( \CHNON=N 01;

N 1'3 N=N 001! H 0 /H 0=CN 6. An azo-dyestufi of the formula N o H -NHC \(|L|-HN /S on f H NH 11 wherein R1 and R2 stand for aromatic radicals Number Name Date each containing at the most two condensed rings. 1,998,507 Jordan et a1 Apr. 23, 1935 OTTO KAISER. 2,120,814 Rose June 14, 1938 ERNST REICH. 2,128,325 Rose Aug. 30, 1938 R RE s ITED 2,390,152 Keller Dec. 4, 1945 f NOE C i d m h FOREIGN PATENTS fighef fsggvsggiierences are 0 recor t e 45 Number Country Date 488,792 France July 22, 1918 UNITED STATES PATENTS OTHER REFERENCES James L. Boy1eIndustrial Chemist, Aug.

Number Name Date 1,098,388 Jordan et a1 June 2, 1914-. 1,292,385 Anderwert Jan. 21, 1919 50 lgagypage 1,975,402 Neelmeier et a1 Oct. 2, 1934 

